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-rw-r--r--channels/misdn/Makefile4
1 files changed, 4 insertions, 0 deletions
diff --git a/channels/misdn/Makefile b/channels/misdn/Makefile
index 895dc9dee..85478225b 100644
--- a/channels/misdn/Makefile
+++ b/channels/misdn/Makefile
@@ -1,6 +1,10 @@
#
# Makefile for chan_misdn support
#
+ifneq ($(wildcard /usr/include/linux/mISDNdsp.h),)
+CFLAGS+=-DMISDN_1_2
+endif
+
all:
%.o: %.c